Saint-Cast-le-Guildo (French pronunciation: [sɛ̃ ka lə ɡildo] ^ⓘ; Breton: Sant-Kast-ar-Gwildoù; Gallo: Saent-Cast-le-Giledo) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. It is port city on the English Channel as it also has a nautical center, the Centre Nautique de Saint-Cast (CNSC) ranked 3rd to 6th in the nation.

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Saint-Cast-le-Guildo Sant-Kast-ar-Gwildoù
Commune
Partial view of Saint-Cast-le-Guildo
Coat of arms
Location of Saint-Cast-le-Guildo
Saint-Cast-le-Guildo Show map of France Saint-Cast-le-Guildo Show map of Brittany
Coordinates: 48°37′48″N 2°15′24″W
Country	France
Region	Brittany
Department	Côtes-d'Armor
Arrondissement	Dinan
Canton	Pléneuf-Val-André
Intercommunality	Dinan Agglomération
Government
• Mayor (2020–2026)	Marie-Madeleine Michel[1]
Area 1	22.63 km2 (8.74 sq mi)
Population  (2021)[2]	3,334
• Density	150/km2 (380/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	22282 /22380
Elevation	0–76 m (0–249 ft)
Website	tourist office
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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The river Arguenon flows through the commune, where it empties into the sea.^[3]

The Battle of St Cast took place on September 11, 1758, when the French repelled the English. The English first attacked the region of Dinard by sea, but were stopped at the Rance by the Vauban fortifications. They were forced to retreat to their fleet in front of St-Cast, where Emmanuel-Armand de Richelieu was waiting for them and launched an attack on the beach while the British were fleeing back onto their vessels. The casualties were heavy for the British army as they lost 1,160 soldiers: the French lost about 445 men. Today there is a monument in the Bourg (neighborhood of St-Cast) showing a greyhound defeating a lion; the Castins defeating a lion (the English symbol).

Inhabitants of Saint-Cast-le-Guildo are called castins in French. In 1971 the former commune of Notre-Dame-de-Guildo was absorbed into Saint-Cast-le-Guildo.^[4]

Saint-Cast features many of the typical dishes of Breton cuisine, such as the Kouign-amann, or the local specialty, Le Castin, which is originally what we call people from there, or in this case the cake.

• Lucienne Heuvelmans (1881–1944), sculptor and illustrator
• Irène Aïtoff (1904–2006), classical pianist and vocal coach
• Anne Beaumanoir (1923–2022), neurophysiologist, one of the Righteous Among the Nations

Saint-Cast-le-Guildo has a oceanic climate (Köppen climate classification Cfb). The average annual temperature in Saint-Cast-le-Guildo is 12.0 °C (53.6 °F). The average annual rainfall is 693.0 mm (27.28 in) with October as the wettest month. The temperatures are highest on average in August, at around 18.0 °C (64.4 °F), and lowest in February, at around 6.8 °C (44.2 °F). The highest temperature ever recorded in Saint-Cast-le-Guildo was 39.0 °C (102.2 °F) on 5 August 2003; the coldest temperature ever recorded was −11.4 °C (11.5 °F) on 17 January 1985.

• Communes of the Côtes-d'Armor department
• https://sites.google.com/site/alderneylocalhistory/Home/1700s/1758-battle-of-st-cast